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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 12:11 am CDT Apr 26, 2025
 
Overnight

Overnight: Mostly cloudy, with a low around 43. North wind around 15 mph, with gusts as high as 30 mph.
Mostly Cloudy


Saturday

Saturday: Mostly cloudy through mid morning, then gradual clearing, with a high near 53. North northeast wind around 15 mph, with gusts as high as 25 mph.
Becoming
Sunny

Saturday
Night
Saturday Night: Mostly clear, with a low around 39. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Mostly Clear


Sunday

Sunday: Mostly sunny, with a high near 64. East northeast wind 5 to 10 mph becoming south southeast in the afternoon. Winds could gust as high as 15 mph.
Mostly Sunny


Sunday
Night
Sunday Night: A 20 percent chance of showers after 1am.  Partly cloudy, with a low around 51. South southeast wind around 10 mph, with gusts as high as 15 mph.
Partly Cloudy
then Slight
Chance
Showers
Monday

Monday: A slight chance of showers, with thunderstorms also possible after 4pm.  Mostly sunny, with a high near 79. Breezy.  Chance of precipitation is 20%.
Slight Chance
Showers then
Slight Chance
T-storms and
Breezy
Monday
Night
Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Showers
Likely

Tuesday

Tuesday: A chance of showers, with thunderstorms also possible after 1pm.  Partly sunny, with a high near 76.
Chance
Showers then
Chance
T-storms
Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 43.
Partly Cloudy


Lo 43 °F Hi 53 °F Lo 39 °F Hi 64 °F Lo 51 °F Hi 79 °F Lo 66 °F Hi 76 °F Lo 43 °F

 

Overnight
 
Mostly cloudy, with a low around 43. North wind around 15 mph, with gusts as high as 30 mph.
Saturday
 
Mostly cloudy through mid morning, then gradual clearing, with a high near 53. North northeast wind around 15 mph, with gusts as high as 25 mph.
Saturday Night
 
Mostly clear, with a low around 39. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
 
Mostly sunny, with a high near 64. East northeast wind 5 to 10 mph becoming south southeast in the afternoon. Winds could gust as high as 15 mph.
Sunday Night
 
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 51. South southeast wind around 10 mph, with gusts as high as 15 mph.
Monday
 
A slight chance of showers, with thunderstorms also possible after 4pm. Mostly sunny, with a high near 79. Breezy. Chance of precipitation is 20%.
Monday Night
 
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Tuesday
 
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76.
Tuesday Night
 
Partly cloudy, with a low around 43.
Wednesday
 
Mostly sunny, with a high near 58.
Wednesday Night
 
Mostly cloudy, with a low around 45.
Thursday
 
A chance of showers. Mostly cloudy, with a high near 63.
Thursday Night
 
A chance of showers. Mostly cloudy, with a low around 47.
Friday
 
A chance of showers. Mostly sunny, with a high near 65.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
332
FXUS63 KLOT 252319
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
619 PM CDT Fri Apr 25 2025

.KEY MESSAGES...

- Brisk north winds tonight followed by seasonably cool and dry
  conditions for Saturday.

- A strong warming trend into Monday with highs in the lower 80s
  for Monday.

- A chance for strong to potentially severe thunderstorms as a
  cold front moves across the region Monday night into Tuesday
  next week.

&&

.DISCUSSION...
Issued at 307 PM CDT Fri Apr 25 2025

Through Sunday:

Showers and isolated storms ending late this afternoon over
northwest IN and east central IL as the shortwave trough and
wave of low pressure move east of the area. Increasing nly
winds are then expected as low pressure deepens across the
lower Great Lakes while a 1030 mb high builds into ern MN and nw
WI. Nly wind gusts of 30-35 mph will be possible near the lake.
Temps will fall into the 40s by Saturday morning.

High pressure will then move across nrn IL and nrn IN Saturday
afternoon and night. Sly winds and warm advection will then
begin on Sunday. High temps Saturday will range from near 60F
toward central IL to around 50F at the lake followed by mid to
upper 60s away from the lake for Sunday.

MG

Sunday Night through Friday:

High pressure will hang on for one more day as temperatures
begin to moderate Sunday. This moderation will be courtesy of
southerly winds and rising heights aloft as a ridge starts to
build into the upper Midwest. Humidity and warmth then increase
Monday as a low pressure system approaches the western end of
Lake Superior. Thunderstorms are expected over the northwestern
half of the CWA Monday morning as a waning LLJ leans over east
into the region. MUCAPE and effective shear appears weak on the
GFS, so any storms look to be sub-severe at this time. The
morning storm potential will be followed by a late morning and
afternoon lull with some potential scattering of the clouds. A
line of storms then looks to form over Iowa and translate east
with time Monday night. GFS soundings support some severe threat
with 1500 to 2000 J/kg of MLCAPE, effective shear of 40 knots
and modest low to mid lapse rates ranging from 6 to 7 C/km.
0-6km shear boundary parallel shear seems to suggest a linear
storm threat with some QLCS potential given cyclonic hodograph
curvature and 0-3km shear around 40 knots. Trends will be
monitored through the weekend to pin down more accurate timing
and threats for Monday. A second threat window also looks
possible Tuesday pending how quickly a boundary clears us
Tuesday morning and afternoon.

Beyond, high pressure moves in mid week, keeping conditions
quiet, before a warm front approaches bringing rain chances
toward the end of the extended period.

CM

&&

.AVIATION /00Z TAFS THROUGH 06Z SATURDAY/...
Issued at 620 PM CDT Fri Apr 25 2025

Aviation forecast concerns for the 00Z TAFs:

- Blustery N to NE winds into Saturday, with gusts 25 kts or
  slightly higher tonight gradually easing tomorrow.

- Period of MVFR ceilings likely from mid-evening into late
  morning/midday Saturday.

Surface low pressure was over south-central lower Michigan early
this evening, with a cold front trailing southwest across
IN/southern IL. Blustery north winds gusting 25-30 kt were
occurring on the back side of this departing low, and will
persist tonight before gradually easing through the day
Saturday. Wind direction is currently NNE for ORD/MDW, but may
back to 350-ish for a time later tonight before shifting more
NNE and NE Saturday. Northeast winds should diminish quickly
Saturday evening as surface high pressure approaches.

Cloud wise, an extensive area was upstream across WI, and should
spread back into the terminals through early-mid evening. Bases
may initially be below 1500 ft, but will likely gradually rise
late tonight into Saturday morning before eventually scattering
to VFR by midday/early afternoon. Can`t rule out some brief IFR
bases along/over Lake Michigan which could affect KGYY later
this evening. Also may be a few isolated sprinkles along/north
of about the I-90 corridor from KRFD to KORD this evening,
though nothing which should be of any significance.

Ratzer

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory until 7 PM CDT Saturday for the IL and IN
     nearshore waters.

&&

$$

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